 
<?php
$servername = "localhost:3306";
$username = "root";
$password = "root";
$dbname = "messages";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
// echo "连接成功";
?>

